Hi everyone, I added a notebook in my page .xml but i have this error help please my file.xml

enter code here

<openerp> <data> <menuitem name="Gestion Ecoles" id="menu_stage_parent"/>
<menuitem name="Etudiants" id="menu_enseignant_parent1" parent="menu_stage_parent"/>

<record model="ir.ui.view" id="view_school_student_form">
    <field name="name">student.form</field>
    <field name="model">student</field>
    <field name="type">form</field>
    <field name="arch" type="xml">
        <form string="Information Eleve">
         <sheet>
            <group colspan="4" col="8">
                <group col="6" colspan="6">
                    <field name="name" colspan="6" />
                    <field name="prenom" colspan="6"/>
                    <field name="cne" colspan="6"/>
                </group>
                <group col="2" colspan="1">
                    <field name="photo"  widget='image' nolabel="1" />
                </group>
            </group>  
            <notebook colspan="4">
               <page string="Remarques">
               <field name="remark"  nolabel="1" colspan="4"/>
                </page>
            </notebook>
            </sheet>
       </form>
    </field>
</record>
<record model="ir.ui.view" id="view_school_student_tree">
    <field name="name">student.tree</field>
    <field name="model">student</field>
    <field name="type">tree</field>
    <field name="arch" type="xml">
        <tree string="stages.enseignant">
            <field name="name"/>
            <field name="prenom"/>
            <field name="cne" />
            <field name="date_adm" />
        </tree>
    </field>
</record>
<record model="ir.actions.act_window" id="action_school_student_form">
    <field name="name">Eleves</field>
    <field name="res_model">student</field>
    <field name="view_type">form</field>
    <field name="view_mode">tree,form</field>
</record>

<!--  Et finalement il y a le menu qui contient l'action pour ouvrir la vue tree de ton module -->

<menuitem action="action_school_student_form" id="menu_stages_enseignant" parent="menu_enseignant_parent1" />

</data> </openerp>